title: Comparative evaluation of microleakage of various retrograde filling materials: An in vitro study.
abstract: OBJECTIVE
  The present study is envisaged to evaluate and compare the microleakage of mineral trioxide aggregate (MTA) with commonly used retrograde filling materials, like light-cured composite with dentin-bonding agents, light-cured glass ionomer cement (LC GIC) and resin-modified zinc oxide eugenol.
  
  
  METHODS
  Ninety freshly extracted non-carious single-rooted human anterior teeth were used in the study. They were randomly divided into four experimental groups and two control groups of 15 each. Following the biomechanical preparation, all teeth were obturated and then the apices of the obturated teeth were resected by removing 3 mm of each apex at 90° to the long axis of the tooth with a straight fissure bur in a high-speed air-rotor handpiece with water coolant. A 3-mm-deep root end cavity was prepared and the root end fillings were placed as per the manufacturer's instructions and according to the groups divided. The samples were then immersed in 1% methylene blue at room temperature for 72 h, 96 h and 1 week and the dye penetration was measured.
  
  
  CONCLUSIONS
  All the four materials used in the study showed some microleakage throughout the experimental period. The sealing ability in terms of microleakage can be summarized as: MTA > Composite resin with dentin bonding agent > LC GIC > Resin modified zinc oxide eugenol.
authors.affiliation: Department of Pedodontics and Preventive Dentistry, Gian Sagar Dental College and Hospital, Rajpura, Punjab, India.
authors.forename: Virat
authors.initials: V
authors.lastname: Galhotra
authors.forename: Anjali
authors.initials: A
authors.lastname: Sofat
authors.forename: Inder K
authors.initials: IK
authors.lastname: Pandit
authors.forename: Ramandeep Singh
authors.initials: RS
authors.lastname: Gambhir
authors.forename: Nikhil
authors.initials: N
authors.lastname: Srivastava
authors.forename: Neeraj
authors.initials: N
authors.lastname: Gugnani
keywords: Comparison; microleakage; retrograde; sealing ability